Journal
ENVIRONMENTAL TECHNOLOGY
Volume 42, Issue 28, Pages 4550-4558Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2020.1770341
Keywords
Anaerobic co-digestion; biodegradability; kinetics; leafy vegetables; methanogenic potential
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Funding
- European Union under the Program Erasmus+ KA107 UCO-UIT-2015
- Spanish Ministry of Economy, Industry and Competitiveness [CTM2017-88723-R]
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Anaerobic co-digestion of residual cabbage and cauliflower mixture at a ratio of 1:1 showed potential for stability and enhanced methane generation, with high biodegradability of the waste mixture studied.
Anaerobic co-digestion of residual cabbage and cauliflower mixed at a ratio 1:1 (w/w) was investigated in two continuously stirred tank reactors under mesophilic conditions to ensure stability and enhanced methane generation. The experiments, including start-up, inoculum acclimatisation and treatment of the waste mixture, were carried out over a 65-day period. The characterisation results showed that the residual mixture contained a high proportion of total Kjeldahl nitrogen (around 37 g N/kg dry weight). The maximum value of methanogenic yield potential was found to be 250 L-STP/kg VS (volatile solid) added, at STP conditions (0 degrees C, 1 atm), by loading organic substrate at a concentration of 1 g VS/L, while its biodegradability was 60%. However, instability of the biomethanisation process was observed after 17 days, which might be a consequence of the high concentration of nitrogen in the reactors. The evaluation of the kinetics of the valorisation process revealed that the waste mixture studied can easily be biodegraded through anaerobic co-digestion.
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